JQuery :: Using If Else Statement With Mouseover

I'm trying to stop my script running if someone mouses over a link with the class .focus.
The code:
$(document).ready(function() {
window.setInterval(function() { //Every 3 seconds do this function
if ("a.focus").mouseover(function() {
//Do nothing
}) else {
$(".list li:nth-child(3)").children().toggleClass('focus'); //Remove class from <li> #3
$(".list li:last").css("height", 0);
$(".list li:last").prependTo(".list").animate({ //Put last <li> to the top of the list and animate the height from 0 to 48
height: 48,
},200, function(){
//Animation Complete
});
$(".list li:nth-child(3)").stop().children().toggleClass('focus'); //Add class to <li> #3
}}, 3000);});